GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

It is currently 22 Feb 2020, 06:43

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

M07-25

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 61385
M07-25  [#permalink]

Show Tags

New post 15 Sep 2014, 23:35
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:49) correct 21% (01:56) wrong based on 154 sessions

HideShow timer Statistics

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 61385
Re M07-25  [#permalink]

Show Tags

New post 15 Sep 2014, 23:35
Official Solution:

In March, 25 percent of a certain company's 80 customers were females, and in April, 40 percent of its 160 customers were males. What is the percent increase from March to April in the number of female customers of the company?

A. 38%
B. 68.75%
C. 79.17%
D. 220%
E. 380%


In March, the company had \(0.25*80=20\) female customers: \(0.25*80=20\);

In April, the company had \((1-0.4)*160=96\) female customers;

General formula for percent increase or decrease, (percent change): \(\text{percent}=\frac{\text{Change}}{\text{Original}}*100\), so \(\text{percent}=\frac{96-20}{20}*100=380%\)


Answer: E
_________________
Intern
Intern
avatar
B
Joined: 27 Jul 2017
Posts: 45
Re: M07-25  [#permalink]

Show Tags

New post 17 Mar 2018, 04:26
Female customers in the month of March, 0.25*80 = 20.

Female customers in the month of April, 60% of 160 customers = 0.6*160 = 96.

% increase = (increase/original)*100 = (96-20/20)*100 = (76/20)*100 = 380%.

The answer is (E).
_________________
Ujjwal
Sharing is Gaining!
Intern
Intern
avatar
B
Joined: 10 Mar 2015
Posts: 5
CAT Tests
Re: M07-25  [#permalink]

Show Tags

New post 14 Sep 2019, 22:55
Bunuel wrote:
Official Solution:

In March, 25 percent of a certain company's 80 customers were females, and in April, 40 percent of its 160 customers were males. What is the percent increase from March to April in the number of female customers of the company?

A. 38%
B. 68.75%
C. 79.17%
D. 220%
E. 380%


In March, the company had \(0.25*80=20\) female customers: \(0.25*80=20\);

In April, the company had \((1-0.4)*160=96\) female customers;

General formula for percent increase or decrease, (percent change): \(\text{percent}=\frac{\text{Change}}{\text{Original}}*100\), so \(\text{percent}=\frac{96-20}{20}*100=380%\)


Answer: E


Hey Brunel,

I have a silly question - if the total number of customers increase - while figuring percent increase, why aren't we making the base same?
Senior Manager
Senior Manager
User avatar
P
Joined: 16 May 2019
Posts: 325
M07-25  [#permalink]

Show Tags

New post 25 Nov 2019, 15:53
Bunuel wrote:
In March, 25 percent of a certain company's 80 customers were females, and in April, 40 percent of its 160 customers were males. What is the percent increase from March to April in the number of female customers of the company?

A. 38%
B. 68.75%
C. 79.17%
D. 220%
E. 380%


Another approach: It can be useful to learn how to be flexible with percent questions. In this case, 25 percent of 80 can be thought of as one-fourth of 80, or 20, easily enough. Then, rather than take something like 0.6 * 160 to get the female customers in April, you can work with 10 percent and multiply the result. 10 percent of any number is that number with the decimal pushed one place to the left. Thus, 10 percent of 160 is 16.0, or just 16. 60 percent can be thought of as six 10 percents, or 6 * (16): 96. Using 20 as the basis for comparison, measuring the growth from 20 to 96 does not require anything more than a cursory glance at the answer choices. Why? Because 100 percent of 20 is 20, and 100 percent more than 20 would thus be 20 + 20, or 40, not even close to the target of 96. Eliminate choices (A) through (C).

If a 100-percent increase is 20 and gets us to 40, then
another 100-percent increase will add 20 more and get us to 60, still too low, and
another 100-percent increase will add 20 more and get us to 80, still too low

You can therefore eliminate choice (D), since a 300-percent increase still leaves us 16 short of 96, which means that only (E) can be the answer. If we were to go up another 100 percent, we would get 80 + 20, or 100, slightly above the target. Nothing else is even close. This is a good question on which to practice breaking down numbers by 10 percent. It is quick and easy, and ball-parking the answer and knowing you are right should not be discounted as a test-taking strategy.

Good luck with your studies.

- Andrew
GMAT Club Bot
M07-25   [#permalink] 25 Nov 2019, 15:53
Display posts from previous: Sort by

M07-25

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: chetan2u, Bunuel






Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne